Seems like you can feed them good sized pellets already since they are pretty big.
My side of the world Hikari is pretty much everywhere but price thou probably a bit steeper.
Probably factor in what your LFS carries in bulk.
For me I do feed market shrimp, frozen ghost shrimp manually from time to time as a treat for everyone.
The pellets are on timer once to twice a day with everything mixed
Aro - Hikari Food Sticks, OF ARG2, Hikari Carnivore
Geo,Uaru - Hikari Cichilds Gold, sinking..
Pleco - Hikari Sinking waffer.
Tube fed cos they have no chance against the cichilds
Rays - Hikari Carnivore